I activated with Verizon in July to lock in unlimited data. At that time I bought a Pixi Plus off Amazon to get me through until the Bionic came out. Now I want to wait until more info about the Vigor and Prime come out and I'd like to buy a used phone (probably a TB) off ebay or craigslist as a stop gap. What do I need to look for or be wary of when buying used? This will be my first Android phone so I'm not familiar with them.